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新化县民间开采用作雕琢工艺品材料的“墨晶石”,经研究查明为一种沉积型滑石矿。滑石矿赋存于上泥盆统及二叠系灰黑色薄层状页岩夹薄层粉砂岩层间,有1—8层,单层一般厚3—5厘米,厚者达7—8厘米,产状与地层一致。周围30公里无岩浆出露。经X射线粉晶衍射和显微镜鉴定,滑石矿石自微晶质—隐晶质致密不规则粒片状滑石集合体及炭质组成。化学分析结果(％)表明与辽宁省大石桥滑石十分相近,其数据如下(括号内为大石桥滑石
Xinhua County, private exploitation of handicrafts used for carving materials, “Mexican spar”, identified as a sediment-type talc mine. Talc deposit occurs in the upper Devonian and Permian gray-black thin-bedded shale folder thin layer of siltstone layer, 1-8 layers, the single layer is generally 3-5 cm thick, the thickness of 7-8 cm , The same shape and formation. Around 30 km without magmatic exposure. By X-ray powder diffraction and microscopic identification, talcum ores are composed of microcrystalline-cryptocrystalline dense irregular granular talcum aggregates and carbonaceous materials. The chemical analysis (%) shows that it is very similar to Dashiqiao Talc in Liaoning Province. The data are as follows (in parentheses, Dashiqiao talc